Definition: Run-length encoding

UN - Geographic Information Systems

A compression technique for raster, grid or image data. Instead of storing each value of adjacent cells that have the same value, the system stores the value and the number of times the value is repeated. Compression will be significant when discrete objects are stored in a raster GIS.
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009

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